Electric water pumps (was) alt charging cont sw

[Clive Apps Techno-Logicals 416 510 0020]

> 
> 
> Think about how much motor/pump it takes to do 100 GPM....
> (I'm guageing this on the 180 GPM Stewartcomponents mentions
> at 9,000 rpm).
> You might need 10-15 at idle..
> Or am I missing something here
> Bruce

no pressure head
it just moves the stuff around
probably a lot of power is not required
maybe 1-2 HP 

Clive 

> >
> >But, isn't it inefficient to spin all those things at engine RPM rather
> >than a constant RPM?  Seems like a pump/compressor that has to work over
> >a 10:1 input speed ratio wouldn't be as efficient as one designed to
> >work at a constant RPM.  Like A/C, and esp power steering.  If those
> >were designed to run w/electric drive at constant RPM maybe they'd be
> >more efficient.  Especially if you had a dual voltage alternator and ran
> >the accessories at 100V 3phase.  maybe?
> >--steve
> 
>